Ransomware Attack Before Holiday Leaves Companies Scrambling

Businesses around the world rushed Saturday to contain a ransomware attack that has paralyzed their computer networks, a situation complicated in the U.S. by offices lightly staffed at the start of the Fourth of July holiday weekend.

In Sweden, most of the grocery chain Coop’s 800 stores were unable to open because their cash registers weren’t working, according to SVT, the country’s public broadcaster. The Swedish State Railways and a major local pharmacy chain were also affected. John Hammond of the security firm Huntress Labs said he was aware of a number of managed-services providers — companies that host IT infrastructure for multiple customers — being hit by the ransomware, which encrypts networks until the victims pay off attackers.

The company added in a statement Saturday that “customers who experienced ransomware and receive a communication from the attackers should not click on any links ― they may be weaponized.” That could also leave those organizations unable to address other security vulnerabilities, such a dangerous Microsoft bug affecting software for print jobs, said James Shank, of threat intelligence firm Team Cymru.

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